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WO2000071955A1 - Procede et dispositif pour le traitement de metaux liquides - Google Patents

Procede et dispositif pour le traitement de metaux liquides Download PDF

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Publication number
WO2000071955A1
WO2000071955A1 PCT/EP2000/004485 EP0004485W WO0071955A1 WO 2000071955 A1 WO2000071955 A1 WO 2000071955A1 EP 0004485 W EP0004485 W EP 0004485W WO 0071955 A1 WO0071955 A1 WO 0071955A1
Authority
WO
WIPO (PCT)
Prior art keywords
addition
melt
vacuum
substances
added
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2000/004485
Other languages
German (de)
English (en)
Inventor
Rainer Teworte
Thomas Rappen
Hans-Jürgen WAHLE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Mevac GmbH
Original Assignee
SMS Mevac GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SMS Mevac GmbH filed Critical SMS Mevac GmbH
Priority to DE10081393T priority Critical patent/DE10081393D2/de
Priority to AU50678/00A priority patent/AU5067800A/en
Priority to EP00935057A priority patent/EP1192401B8/fr
Publication of WO2000071955A1 publication Critical patent/WO2000071955A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to a method for the vacuum treatment of liquid metals, in particular steel, in a secondary metallurgical plant with addition substances, in particular deoxidizing and / or alloying agents, the amounts of which are determined, weighed and provided after a basic sample and the target analysis.
  • Such a process is mainly carried out to give a melt the desired composition and other properties such.
  • B. to give the required casting temperature.
  • the inert atmosphere of a sufficiently large vacuum is particularly suitable for this.
  • this requires a gas-tight sealable vacuum vessel, into which the melt is introduced and in which a vacuum is created, the gases being drawn off.
  • the generation of such a vacuum alone is generally not sufficient for the treatment, but various additives must also be added to the melt in the right amounts and at the right time.
  • systems for carrying out such a process have a vacuum lock.
  • This consists of a lock chamber, which is connected to the interior of the vacuum vessel, for example via a feed pipe, and an addition funnel arranged above the lock chamber and connected to its interior.
  • the lock chamber and the addition funnel have lower outlet openings which are provided with gas-tight closures.
  • Such a method also includes the provision and introduction of the addition materials such as deoxidizing agents, alloying agents, cooling scrap and the like into the vacuum lock.
  • the added materials are kept in stock in separate loading bunkers, portioned by weighing in weighing bunkers, possibly combined in a collecting bunker and stored there for a short time, if necessary, before they are fed to the addition hopper.
  • the added materials are transported via conveyor troughs, straight and steep conveyors.
  • Techn. Mitt. AEG-Telefunken 70 (1980) 2/3 show on page 74 in picture 1 such a loading device.
  • the workflow for example in a steel mill, or the requirements of a downstream continuous casting plant or other operational conditions make it necessary that the method mentioned at the outset must be carried out within a very limited time. Consequently, in order to save time, it is necessary to determine the type and quantity of the additives as early as possible, because the removal, weighing and transporting of the individual additives to the vacuum vessel requires a significant amount of time. For this reason, a basic sample is taken from the melt at the start of the process and a process computer is used to determine which and how much additive substances have to be added to the melt in order to achieve the desired finished analysis. As soon as the result is available, the added materials are removed from the loading bunkers, weighed and made available.
  • Storage containers of this type have the disadvantage that they are not suitable for larger quantities and therefore for the most important additions, because the cellular wheels convey too little quantity and therefore too much time would be lost.
  • they are only suitable for additives with small grain sizes, because larger grain often causes canting and jamming between the grain and cellular wheel. Then the cells of the cellular wheels are no longer constantly and completely filled or emptied. There is therefore no precise control over the amount added. Since the cellular wheels determine the addition amounts based on their volume, different grain sizes with the same addition material change the ratio between volume and bulk density, especially with microalloying, it is not possible to determine the effective addition amount precisely enough.
  • Refilling the storage containers is also problematic.
  • the vacuum must be released, which is only possible during breaks in treatment, which necessarily interrupt the operating sequence.
  • An additional loading device is also required. Evacuating after refilling takes more time. After all, the system control is also significantly more complex.
  • the invention is based on the problem of creating a method and a system by means of which the necessary additives for influencing the chemical composition and / or for adjusting the temperature are as possible without a time delay and without the risk of rejects at the right time and in the right amount allow to be fed into the melt.
  • This problem is solved according to the invention in that, in the method mentioned at the outset, the correction amounts of addition substances required after a further sampling of the melt (correction sample) are fed past the already portioned addition substances via a vacuum lock of the melt.
  • the addition substances for example exothermic oxidizable substances, such as aluminum or cooling scrap or ore as an oxygen carrier, can be added in total in the type and amount of the melt, without having to intervene in the normal feed and without having to put up with additional evacuated storage containers with cellular wheels.
  • Cooling scrap can be added to adjust the temperature of the melt or the melt can be chemically heated in a system with an oxygen blowing device. In order to do this at any time independently of the rest of the feed system, it is necessary to add the necessary cooling or heating material past the addition of the alloying agent.
  • the invention also relates to a plant for carrying out the method according to the invention, with a vacuum vessel containing liquid metal, which is accessible via a vacuum lock, which has a lock chamber and at least one addition funnel arranged above it.
  • a vacuum vessel containing liquid metal which is accessible via a vacuum lock, which has a lock chamber and at least one addition funnel arranged above it.
  • the lock chamber and the addition funnel have lower outlet openings with gas-tight closures.
  • the lock chamber has only one addition funnel, several addition funnels are arranged according to the invention above the lock chamber.
  • the additional and, if necessary, further addition funnels open additional loading paths to the lock chamber and thus to the melt.
  • Additive substances that are no longer suitable and / or incorrectly weighed or portioned can neither prevent nor delay the completion of the melt. They can even remain in the main hopper for a subsequent batch.
  • addition funnels are of different sizes and / or different designs. They can thus be adapted to the amount of the respective additive and its grain size. We recommend a size that enables the largest possible quantities. However, small addition funnels are useful for microalloying. In addition, the available space can be better used with small addition funnels.
  • auxiliary funnels is assigned an additional bunker or a smaller bunker group.
  • main bunker group which consists of about ten to twenty loading bunkers for various additives
  • smaller bunkers are usually available for loading the auxiliary funnels with alloying agents.
  • These auxiliary bunkers can contain at least some of the same additives as in the main bunkers. It is advisable if the auxiliary bunkers are equipped with a device for trigger weighing. From these bunkers it can then be conveyed directly into one or more of the auxiliary funnels.
  • a system in which the lock chamber of the vacuum lock has several addition funnels and the addition materials are divided between the main and auxiliary bunkers allows an optimal addition of addition materials without any time delay.
  • the invention is illustrated in the drawings by means of exemplary embodiments. Show it:
  • Figure 1 shows a system according to the invention, partially in vertical section.
  • Fig. 2 shows another system, partly in vertical section.
  • a ladle 1 contains a melt 2, into which two dip tubes 3 and 4 of a circulation vacuum vessel 5 arranged above protrude from above.
  • a vacuum line 6 is connected to the upper part 5a of the vacuum vessel 5, through which the resulting gases are drawn off and a vacuum is generated in the interior of the vacuum vessel 5. With the help of a lift gas, the melt 2 passes through the pipe 3 in a circuit through the vacuum vessel 5 and the other dip pipe 4 back into the pan 1.
  • a feed pipe 7 opens into the interior of the vacuum vessel 5. It serves to add substances that are added through a vacuum lock 8.
  • the vacuum lock 8 has a closed lock chamber 9, the lower outlet opening of which is closed with a gas-tight closure 10, here a so-called bell closure.
  • the top of the lock chamber 9 is also closed.
  • Two addition funnels 11, 12 are arranged on it. Further addition funnels can also be arranged here.
  • Each addition funnel 11, 12 is connected to the interior of the lock chamber 9 via an outlet opening which is closed in each case with a gastight closure 13 or 14.
  • the closures 10, 13 and 14 can optionally be opened and closed using preferably pneumatic working cylinders 15, 16, 17.
  • the addition funnels 11, 12 are open at the top.
  • Addition substances are first filled into the addition funnels 11, 12. If the contents of an addition funnel 11, 12 are to be fed to the melt 2, the lock chamber 9 is flooded with ambient air by opening a valve (not shown) in order to release the vacuum therein. Then the closures 13 and / or 14 are opened so that the additives fall into the lock chamber 9. After the closures 13, 14 and the valve opened when flooding with ambient air are closed again in a gas-tight manner, the lock chamber 9 is connected to the vacuum line 6 and the vacuum is again established in it. Only then can the WO 00/71955. g - PCT EP00 / 04485
  • Closure 10 opened and the additives are added through the feed pipe 7 of the melt. The closure 10 is then closed again so that the lock chamber 9 is again available for the reception of additional substances.
  • auxiliary bunker 21 Above the larger addition funnel 11 ends a conveyor belt 18, which feeds the addition materials in weighed quantities from a main bunker group, not shown, and fills them into the addition funnel 11. Above the smaller auxiliary funnel 12 ends a tube conveyor 19, the mouth of which can be closed with a flap 20. The tube conveyor 19 is arranged below an auxiliary bunker 21. With the help of load cells 22, which determine the respective weight of the auxiliary bunker 21, a certain amount of the additive contained in the auxiliary bunker 21, for example an alloying agent, can be drawn off and fed via the tube conveyor 19 to the addition funnel 12, which is achieved by opening the previously closed flap 20 happens.
  • auxiliary bunkers 21 can be assigned to auxiliary hopper 12.
  • the system can have more than two addition funnels 11, 12.
  • FIG. 2 shows a vacuum vessel 23 for standing degassing.
  • the ladle 1 is with the melt 2 in the vacuum vessel 23, and the vacuum line 6 is arranged on the side of the vacuum vessel 23.
  • the head of the vacuum vessel 23 is designed as a lid 23a, which can be removed for inserting and removing the ladle 1 and can be put on again gas-tight.
  • the inside of the cover 23a is provided with a refractory shield 24, in which the mouth of the feed pipe 7 is also located.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

L'invention concerne un procédé pour le traitement de métaux liquides sous vide, ainsi qu'un dispositif pour la mise en oeuvre de ce procédé. Le procédé fournit des moyens améliorant les possibilités d'introduire des additifs dans le mélange en fusion, par l'intermédiaire d'un sas sous vide, et ceci, au moment voulu et en quantités convenables. Le dispositif comprend un récipient à vide (5) muni d'un sas sous vide (8) au-dessus duquel sont disposés plusieurs entonnoirs (11) d'alimentation des additifs qui peuvent être actionnés séparément.
PCT/EP2000/004485 1999-05-20 2000-05-18 Procede et dispositif pour le traitement de metaux liquides Ceased WO2000071955A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE10081393T DE10081393D2 (de) 1999-05-20 2000-05-18 Verfahren und Anlage zum Behandeln von flüssigen Metallen
AU50678/00A AU5067800A (en) 1999-05-20 2000-05-18 Method and system for the treatment of liquid metals
EP00935057A EP1192401B8 (fr) 1999-05-20 2000-05-18 Procede et dispositif pour le traitement de metaux liquides

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19923205.9 1999-05-20
DE19923205A DE19923205C1 (de) 1999-05-20 1999-05-20 Verfahren und Anlage zum Behandeln von flüssigen Metallen

Publications (1)

Publication Number Publication Date
WO2000071955A1 true WO2000071955A1 (fr) 2000-11-30

Family

ID=7908664

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/004485 Ceased WO2000071955A1 (fr) 1999-05-20 2000-05-18 Procede et dispositif pour le traitement de metaux liquides

Country Status (6)

Country Link
EP (1) EP1192401B8 (fr)
AT (1) ATE249719T1 (fr)
AU (1) AU5067800A (fr)
DE (2) DE19923205C1 (fr)
ES (1) ES2188547T3 (fr)
WO (1) WO2000071955A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2495138C1 (ru) * 2012-05-17 2013-10-10 Открытое акционерное общество Акционерная холдинговая компания "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения имени академика Целикова" (ОАО АХК "ВНИИМЕТМАШ") Способ внепечной обработки жидкой стали
RU2532243C1 (ru) * 2013-03-14 2014-10-27 Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Национальный исследовательский технологический университет "МИСиС" Агрегат комплексной обработки жидкой стали (акос)
RU2532584C1 (ru) * 2013-03-14 2014-11-10 Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Национальный исследовательский технологический университет "МИСиС" Способ комплексной обработки жидкого металла в агрегате ковш-печь
RU2614862C2 (ru) * 2015-09-22 2017-03-29 Акционерное общество Акционерная холдинговая Компания "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения имени академика Целикова" (АО АХК "ВНИИМЕТМАШ") Способ и устройство для внепечной обработки металла в ковше
RU2653957C1 (ru) * 2016-12-21 2018-05-15 Акционерное общество Акционерная холдинговая Компания "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения имени академика Целикова" (АО АХК "ВНИИМЕТМАШ") Устройство для обработки металла в ковше
CN114262767B (zh) * 2021-12-03 2023-05-16 本钢板材股份有限公司 一种基于大林算法的rh炉氧枪控制方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1435973A (fr) * 1965-03-01 1966-04-22 Marrel Freres S A Procédé d'addition de matières solides dans une enceinte sous vide contenant du métal en fusion et installation pour sa mise en oeuvre
DE1215186B (de) * 1961-05-16 1966-04-28 Mc Graw Edison Co Vorrichtung zum Entgasen von Metallschmelzen
US3345055A (en) * 1963-07-16 1967-10-03 Dortmund Horder Hullenunion Ag Additive measuring device for vacuum degasification vessels
GB1129726A (en) * 1966-08-10 1968-10-09 Dortmund Hoerder Huttenunion A Device for introducing material into degassing vessels for steel
JPS5541946A (en) * 1978-09-20 1980-03-25 Mitsubishi Heavy Ind Ltd Additive adding device in continuous vacuum degassing apparatus for molten steel
JPH09111330A (ja) * 1995-10-17 1997-04-28 Sumitomo Metal Ind Ltd 取鍋精錬装置における溶鋼の昇温方法
JPH11335721A (ja) * 1998-05-25 1999-12-07 Sumitomo Metal Ind Ltd 炉外精錬における溶湯の温度制御方法及びその装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4612043A (en) * 1984-03-29 1986-09-16 Pennsylvania Engineering Corporation Steel making method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1215186B (de) * 1961-05-16 1966-04-28 Mc Graw Edison Co Vorrichtung zum Entgasen von Metallschmelzen
US3345055A (en) * 1963-07-16 1967-10-03 Dortmund Horder Hullenunion Ag Additive measuring device for vacuum degasification vessels
FR1435973A (fr) * 1965-03-01 1966-04-22 Marrel Freres S A Procédé d'addition de matières solides dans une enceinte sous vide contenant du métal en fusion et installation pour sa mise en oeuvre
GB1129726A (en) * 1966-08-10 1968-10-09 Dortmund Hoerder Huttenunion A Device for introducing material into degassing vessels for steel
JPS5541946A (en) * 1978-09-20 1980-03-25 Mitsubishi Heavy Ind Ltd Additive adding device in continuous vacuum degassing apparatus for molten steel
JPH09111330A (ja) * 1995-10-17 1997-04-28 Sumitomo Metal Ind Ltd 取鍋精錬装置における溶鋼の昇温方法
JPH11335721A (ja) * 1998-05-25 1999-12-07 Sumitomo Metal Ind Ltd 炉外精錬における溶湯の温度制御方法及びその装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 004, no. 077 (C - 013) 4 June 1980 (1980-06-04) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 08 29 August 1997 (1997-08-29) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 03 30 March 2000 (2000-03-30) *

Also Published As

Publication number Publication date
ATE249719T1 (de) 2003-03-15
EP1192401B1 (fr) 2003-01-02
DE10081393D2 (de) 2001-11-08
EP1192401A1 (fr) 2002-04-03
EP1192401B8 (fr) 2003-02-26
ES2188547T3 (es) 2003-07-01
DE19923205C1 (de) 2000-11-30
AU5067800A (en) 2000-12-12

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